|Represent|Contestant|Age|Height|Hometown|
|---|---|---|---|---|
|Alta Verapaz|Casetie Lily Dubois Caravantes|23|1.74 m (5 ft 8 1⁄2 in)|Copán|
|Chimaltenango|Wendy Karina Albizures del Cid|19|1.83 m (6 ft 0 in)|Chimaltenango|
|Ciudad Capital|Rita Elizabeth Meda Cojulún|19|1.77 m (5 ft 9 1⁄2 in)|Ciudad Guatemala|
|Guatemala|Ana Maribel Arana Ruiz|22|1.79 m (5 ft 10 1⁄2 in)|Villa Nueva|
|Izabal|Jessica Jazmín Donabó Chávez|18|1.75 m (5 ft 9 in)|Puerto Barrios|
|Jalapa|Luz Yohana Marroquín Morán|20|1.76 m (5 ft 9 1⁄2 in)|Jalapa|
|Quetzaltenango|Clara Jennifer Chiong Estrada|24|1.81 m (5 ft 11 1⁄2 in)|Quetzaltenango|

Question: how many delegates are at most 20 years old?
Answer: 4